The Willem Hendrik Keesom reference article from the English Wikipedia on 24-Apr-2004
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Willem Hendrik Keesom

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Willem Hendrik Keesom was a Dutch scientist who in 1926 invented a method to solidify helium.

He had been student of Heike Kamerlingh Onnes, who had been the first to liquefy helium (a feat for which Onnes received a Nobel Prize).